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Climate Change Effects in the Western Himalayan Ecosystems of India: Evidence and Strategies Vindhya Prasad Tewari1*, Raj Kumar Verma1 and Klaus Von Gadow2,3

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Climate Change Effects in the Western Himalayan Ecosystems of India: Evidence and Strategies Vindhya Prasad Tewari1*, Raj Kumar Verma1 and Klaus Von Gadow2,3 Tewari et al. Forest Ecosystems (2017) 4:13 DOI 10.1186/s40663-017-0100-4 REVIEW Open Access Climate change effects in the Western Himalayan ecosystems of India: evidence and strategies Vindhya Prasad Tewari1*, Raj Kumar Verma1 and Klaus von Gadow2,3 Abstract Background: The fragile landscapes of the Himalayan region are highly susceptible to natural hazards, and there is ongoing concern about current and potential climate change impacts. This study provides background information on India’sWesternHimalayasandreviewsevidenceofwarming as well as variability in precipitation and extreme events. Methods: Understanding and anticipating the impacts of climate change on Himalayan forest ecosystems and the services they provide to people are critical. Efforts to develop and implement effective policies and management strategies for climate change mitigation and adaptation requires particular new research initiatives. The various studies initiated and conducted in the region are compiled here. Results: Several new initiatives taken by the Himalayan Forest Research Institute in Shimla are described. This includes new permanent observational field studies, some with mapped trees, in high altitude transitional zones for continuous monitoring of vegetation response. We have also presented new strategies for mitigating potential climate change effects in Himalayan forest ecosystems. Conclusions: Assessment of the ecological and genetic diversity of the Himalayan conifers is required to evaluate potential responses to changing climatic conditions. Conservation strategies for the important temperate medicinal plants need to be developed. The impact of climate change on insects and pathogens in the Himalayas also need to be assessed. Coordinated efforts are necessary to develop effective strategies for adaptation and mitigation. Keywords: Himalayan ecosystem, Climate change, New strategies, High altitude, New observational studies Background change impacts which may include abnormal floods, The Indian Himalayan region is home to about 51 droughts and landslides (Barnett et al. 2005; Cruz et al. million people, many of whom practice hill agriculture 2007), loss of biodiversity and threats to food security in fragile and diverse ecosystems, including species-rich (Xu et al. 2009). In order to fulfil India’s vision of sus- forests. The region has a considerable hydropower tainable development in the context of climate change, a potential and feeds numerous perennial rivers which National Action Plan on Climate Change was launched depend upon the sustainable existence of glaciers in June 2008. This National Action Plan includes eight (GoI 2010, DST 2012). Due to its high biological and specific objectives, including a “National Mission for socio-cultural diversity, the region has been identified as Sustaining the Himalayan Eco-systems” and a “National one of 34 “biological hotspots” by Gautam et al. (2013). Mission on Strategic Knowledge for Climate Change”. The fragile landscapes of the Himalayan region are Mountain ecosystems are important for economic highly susceptible to natural hazards, and there is on- growth and human well-being. They provide numerous going concern about current and potential climate public goods and services including fresh water, food, lifesaving medicinal products, energy, Bio-diversity and * Correspondence: [email protected] associated traditional knowledge. However, these ser- 1Himalayan Forest Research Institute, Shimla, HP, India vices have received comparatively little recognition in Full list of author information is available at the end of the article © The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. Tewari et al. Forest Ecosystems (2017) 4:13 Page 2 of 9 national economic decision-making (Pandey 2012). would face a high risk of extinction if the global aver- Mountains are among the most fragile environments age temperature increase would exceed 2–3°Cabove and are most vulnerable to catastrophic events. If moun- the pre-industrial level. tains become degraded, or fail to provide essential ser- vices, the costs may be severe. Therefore, Chapter 13 of Local evidence the United Nations Agenda 21 specifically recognizes Several studies evaluating the impact of climate change on the value of mountain systems. Yet these recommenda- forest ecosystems in India have been published recently tions are not sufficiently reflected in national, regional, (for example, Chaturvedi et al. 2011; Gopalakrishnan et al. and international policies and priorities (Pandey 2012). 2011). However, most of these studies lack an assessment In India’s Western Himalayas, changes in altitude are of expected development at the local level (Upgupta et al. dramatic producing a very specific pattern of vegetation 2015). Evidence collected at local climate stations in the types that include alluvial grasslands, subtropical forests, Himalayas overwhelmingly show a warming trend, albeit conifer mountain forests and alpine meadows. The plant at different rates and in different periods depending on species that inhabit the mountains have already started specific regional and seasonal circumstances (Gautam et to migrate to higher altitudes due to warming (Padma al. 2013). 2014), and some are in danger of being lost before anyone has even recorded their existence. The melting Local warming glaciers are often the principal concern of climate Analyses of temperature trends in the Himalayan region change in the Himalayas. However, the region is also have shown that temperature increases are greater at the home to one-tenth of the world’s known higher- higher altitudes than in the lowlands (Shrestha et al. altitude plant and animal species, and half of India’s 1999). In a regional study using a reconstructed native plant species (Padma 2014). Particularly rich in temperature dataset of the Climate Research Unit, Brohan biodiversity are the Western Himalayas that include et al. (2006) and Diodato et al. (2012) concluded that the Indian states of Himachal Pradesh, Jammu and during the last few decades the Himalayan and Tibetan Kashmir, Uttarakhand and Sikkim, where elevations Plateau regions have been warming at a rate higher than vary from 300 m to more than 6000 m and where the rates observed during the past century. They show a the mountains thus act as a natural barrier to species 0.5 °C increase in the average maximum temperature migration (Padma 2014). (Tmax) during the period 1971–2005 when compared to the period 1901–1960. Dash et al. (2007) reported that in Evidence of warming the western Indian Himalayas a 0.9 °C average increase Global evidence was observed during the 102-year period 1901–2003. The State of the Climate report of the US National They found that much of this observed trend is due to in- Oceanic and Atmospheric Administration (NOAA creasing temperatures after 1972. Dimri and Dash (2012) 2009), presents overwhelming evidence that the Earth also found a warming trend over the western Indian is warming. The evidence is based on 10 indicators. Himalayas, with the greatest observed increase in Tmax be- Seven of these are increasing (air temperature in the tween 1.1 °C and 2.5 °C. In the north-western Indian troposphere; specific humidity; Ocean heat content; Himalayan region, Bhutiyani et al. (2007) found an in- rising sea level; sea-surface temperature; temperature crease of 0.16 °C per decade during the past century. over oceans; temperature over land) while three indi- Singh et al. (2008) also observed increasing trends in the cators are decreasing (extent of snow cover; volume seasonal average of the daily maximum temperature for of glaciers and sea ice). all seasons, except during monsoon, over the lower According to IPCC (2014) climate and non-climate Indus basin in the north-western Indian Himalayas. stressors are projected to have a direct effect on for- Shekhar et al. (2010) presented analyses at different est ecosystems during the twenty-first century, which ranges of the western Himalayas which show significant will cause large-scale forest die-back, biodiversity loss variations in temperature and snowfall during the past and reduced ecosystem services. Fischlin (2007) re- few decades. These various findings from the region are ports that 20%–30% of the plant and animal species summarised in Table 1. Table 1 Summary of the various findings about the rise of the temperature in Western Himalayas Brohan et al. (2006), Diodato et al. (2012) Dash et al. (2007) Dimri and Dash (2012) Bhutiyani et al. (2007) 0.5 °C increase in the average Average increase of 0.9 °C in Increase in maximum Increase of temperature 0.16 °C maximum temperature (Tmax) temperature during 1901–2003 temperature between per decade during the century during 1971–2005 compared 1.1 and 2.5 °C to 1901–1960 Tewari et al. Forest Ecosystems (2017) 4:13 Page 3 of 9 Local variability in precipitation and extreme events are 377.5, 285.2, 1723.0 and 526.2 mm, respectively Based on observations at three weather stations, while the mean total annual rainfall is 1251.0 mm, all Bhutiyani et al. (2010) reported a statistically significant during 2004–2012. downward trend (at 5% significance level) in
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